Check out the companies making headlines before the bell. GE Aerospace — The stock moved more than 4% higher after GE Aerospace reported adjusted earnings of $1.49 per share, topping the $1.27 per share anticipated by analysts polled by LSEG. Revenue, however, came in just shy of expectations. Hertz Global Holdings — Shares fell almost 2% after the rental car company rallied 112% last week on Bill Ackman's big investment in the company. Pershing Square has taken a 19.8% stake in Hertz with outright share ownership and total return swaps. The stock fell 5% on Monday. Zions Bancorporation — Shares of the Utah-based bank sunk nearly 4% after Zions reported weaker-than-expected first-quarter results. Zions earned $1.13 per share, shy of the LSEG forecast of $1.18 per share. 3M — Shares of the manufacturing conglomerate rose nearly 6% after first-quarter results beat expectations. On an adjusted basis, 3M earned $1.88 per share on $5.78 billion of revenue. Analysts surveyed by Refinitiv had penciled in $1.77 per share and $5.76 billion of revenue. Amazon — Shares rose nearly 1% after Amazon delayed some commitments around new data center leases, particularly international ones, Wells Fargo said on Monday. Amazon Web Services is one of the leading providers of cloud infrastructure. Calix — The technology services stock jumped 15% after Calix exceeded first-quarter earnings expectations and gave an upbeat forecast. Calix earned 19 cents per share, excluding items, on $220.2 million in revenue in the latest period, while analysts surveyed by FactSet anticipated 13 cents per share in earnings and $207.1 million in revenue. Medpace Holdings — Shares of the clinical research organization lost 8% after Medpace reported that its net new business awards in the first quarter came in at $500 million, reflecting a nearly 19% decline from the year-ago period. Verizon — Shares wireless network operator declined more than 4% after Verizon said it lost more postpaid net phone subscribers during the last quarter than were expected. The company still beat forecasts for first-quarter earnings and revenue and said it remains confident in achieving its year-end goals. Its adjusted earnings of $1.19 per share beat the consensus estimate of $1.15 per share, while its revenue of $33.49 billion beat expectations of $33.24 billion, according to analysts polled by LSEG. Lockheed Martin — Shares of the defense contractor jumped more than 3% after Lockheed posted a strong first-quarter profit and reaffirmed its forecasts for the year, driven by resilient demand for its missile systems and fighter jets. Lockheed reported total revenue of $17.96 billion in the first quarter, up 4.5% from a year earlier. — CNBC's Jesse Pound, Sarah Min and Michelle Fox contributed reporting.